A company makes a device that can be fitted to automobile engines to improve the mileage.The company claims that if the device is installed,owners will observe a mean increase of more than 3.0 mpg.Assuming that the population standard deviation of increase is known to be 0.75 mpg,and a sample of size 64 cars is selected with an 
= 3.25 mpg,use the p-value approach to test the null hypothesis using a significance level of 0.05.
Definitions:
A business-oriented website that lets users post their professional profiles to connect to a network of businesspeople, who are also called connections.
A social media platform that focuses on photo and video sharing, allowing users to create and share content with followers.
Social Network
A platform or website that enables users to create and share content or to participate in social networking.
Millions of Users
A term describing a product or service that is used by over a million individuals or accounts.
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